The invention provides a light guide element (1300) comprising a light guide (300), wherein the light guide (300) in comprises a first light guide face (301) and a second light guide face (302) with UV radiation transmissive light guide material (305) between the first light guide face (301) and the second light guide face (302), wherein the light guide element (1300) further comprises one or more of: (i) a first layer element (30) in contact with the first light guide face (301), wherein the first layer element (30) is transmissive for UV radiation; and (ii) a second layer element (130) in contact with the second light guide face (301), wherein the second layer element (130) has one or more functionalities selected from the group consisting of (a) reflective for UV radiation, (b) adhesive for adhering the light guide (300) to an object, (c) reinforcing the light guide element (1300), and (d) protective for the light guide (300).